added autocenter button
added gui.js for all gui setups
added show WMS-Layer toogle button
added some documentation
updated status header
added a few buttons
changed a few var names
included compass functions for realposition
added compass-line for current drive angle
moved all config variables from global into cfg namespace
moved layers into mapLayers namespace
moved features into mapFeatures namespace
added driveline functionality
stored all cfg variables in localstorage
added driveline move function via ctrl b, ctrl n, ctrl shift b, ctrl shift n
add new drivelines with keyboard keys "a" for left side and "s" for right side of the original driveline
navigate between drivelines with "a" and "s"
auto saves drivelines to localstorage
auto storing and loading drivelines to and from localstorage
now shows area in square-meter covered by drivelines
fixed a bug with get geodesicarea: somehow the OpenLayers.Points stored in global (helppoints, points of drivelines) are no longer points when you reload the page so getGeodesicArea had an error. Fix: make new OpenLayers.Geometry.Points when reading von global and localstorage on reload
set driveline through gps position
added keyboard shortcuts:
ctrl + shift + w     set driveLine startpoint gps
ctrl + shift + e     set driveLine endpoint gps
m                    toggle showMap wms
a                    switch active driveline left
s                    switch active driveline right
z                    toggle auto center
added shortcut ctrl+shift+o toggle compass
Merge branch 'feature/drivelines' into develop